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If the dialog is opened from OS settings, it does not show the
timezone. However, the C++ code can sometimes send a timezone update
while the dialog is open.

Only update the timezone select if it is showing. Always send the
current timezone from C++ when the dialog opens, such that we can
adjust the time picker appropriately if the timezone changes.

Bug: 1015179
Test: added to JS tests
Change-Id: I1cd641c377a209c114d4c1359acbce775bf438c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2052565Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741097}